
An Ocean liner called Vienna is to come into Bigg City Port but Lillie Lightships needs to refuel, if there isn't a light Vienna can't come. Supplies are low, Ten Cents and Sunshine try to find oil for Lillie but they only find one which Zorran has and he won't give it to them, He says it's for Vienna. Sunshine knows where to find a light barge. Zip and Zug get the wrong end of the stick and trap Ten Cents and Sunshine by using a fire barge. Both fleets are waiting anxiously for Vienna but there is no light. Luckily Warrior saves the day by setting his garbage barge alight for a light for Vienna. Ten Cents and Sunshine wait for the tide to set them free. Vienna comes to Bigg City, the tugs do their job and she goes on her way.
It is the 1920's: Rival tug fleets compete for work in Bigg City Port. Captain Star briefs his Star Tugs - he's trying the regular contract to dock The Duchess ocean liner. It'll be a difficult job but to help out, the captain has recruited Sunshine, a small switcher. The rival Z-Stacks are encouraged by their devious Captain Zero to sabotage the operation. Their leader Zorran runs Big Mac aground, and nudges Sunshine into The Duchess's bow, swinging her dangerously. Captain Star orders Sunshine's dismissal, but he runs away, and is lost in the harbour in a thick fog.
Ten Cents delivers his last cargo barge to the Old Quay after a very busy day. As night falls, it is towed away by a mysterious boat. Captain Star is cross to hear that one of his customer's deliveries is missing and puts Ten Cents on dredger detail - not a pleasant task. But Grampus, a small submarine, sees another barge being stolen at night, so Captain Star and Captain Zero join forces to find the thief....